blob: eba1b7ac729454d30b1d611cd01d45b5ba23407e [file] [log] [blame]
Anthony Liguori33436602007-11-12 21:30:26 -06001/*
Michael S. Tsirkina90fdce2014-12-08 12:31:02 +02002 * Virtio PCI driver - common functionality for all device versions
Anthony Liguori33436602007-11-12 21:30:26 -06003 *
4 * This module allows virtio devices to be used over a virtual PCI device.
5 * This can be used with QEMU based VMMs like KVM or Xen.
6 *
7 * Copyright IBM Corp. 2007
Michael S. Tsirkina90fdce2014-12-08 12:31:02 +02008 * Copyright Red Hat, Inc. 2014
Anthony Liguori33436602007-11-12 21:30:26 -06009 *
10 * Authors:
11 * Anthony Liguori <aliguori@us.ibm.com>
Michael S. Tsirkina90fdce2014-12-08 12:31:02 +020012 * Rusty Russell <rusty@rustcorp.com.au>
13 * Michael S. Tsirkin <mst@redhat.com>
Anthony Liguori33436602007-11-12 21:30:26 -060014 *
15 * This work is licensed under the terms of the GNU GPL, version 2 or later.
16 * See the COPYING file in the top-level directory.
17 *
18 */
19
Michael S. Tsirkin5f4c9762014-12-08 16:39:45 +020020#include "virtio_pci_common.h"
Anthony Liguori33436602007-11-12 21:30:26 -060021
Michael S. Tsirkinac399d82015-01-15 17:54:13 +020022static bool force_legacy = false;
23
24#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
25module_param(force_legacy, bool, 0444);
26MODULE_PARM_DESC(force_legacy,
27 "Force legacy mode for transitional virtio 1 devices");
28#endif
29
Michael S. Tsirkine6af5782011-11-17 17:41:15 +020030/* wait for pending irq handlers */
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +020031void vp_synchronize_vectors(struct virtio_device *vdev)
Michael S. Tsirkine6af5782011-11-17 17:41:15 +020032{
33 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
34 int i;
35
36 if (vp_dev->intx_enabled)
37 synchronize_irq(vp_dev->pci_dev->irq);
38
39 for (i = 0; i < vp_dev->msix_vectors; ++i)
40 synchronize_irq(vp_dev->msix_entries[i].vector);
41}
42
Anthony Liguori33436602007-11-12 21:30:26 -060043/* the notify function used when creating a virt queue */
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +020044bool vp_notify(struct virtqueue *vq)
Anthony Liguori33436602007-11-12 21:30:26 -060045{
Anthony Liguori33436602007-11-12 21:30:26 -060046 /* we write the queue's selector into the notification register to
47 * signal the other end */
Michael S. Tsirkinf30eaf42014-12-03 18:01:58 +020048 iowrite16(vq->index, (void __iomem *)vq->priv);
Heinz Graalfs46f9c2b2013-10-29 09:38:50 +103049 return true;
Anthony Liguori33436602007-11-12 21:30:26 -060050}
51
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +030052/* Handle a configuration change: Tell driver if it wants to know. */
53static irqreturn_t vp_config_changed(int irq, void *opaque)
54{
55 struct virtio_pci_device *vp_dev = opaque;
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +030056
Michael S. Tsirkin016c98c2014-10-14 10:40:34 +103057 virtio_config_changed(&vp_dev->vdev);
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +030058 return IRQ_HANDLED;
59}
60
61/* Notify all virtqueues on an interrupt. */
62static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
63{
64 struct virtio_pci_device *vp_dev = opaque;
65 struct virtio_pci_vq_info *info;
66 irqreturn_t ret = IRQ_NONE;
67 unsigned long flags;
68
69 spin_lock_irqsave(&vp_dev->lock, flags);
70 list_for_each_entry(info, &vp_dev->virtqueues, node) {
71 if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
72 ret = IRQ_HANDLED;
73 }
74 spin_unlock_irqrestore(&vp_dev->lock, flags);
75
76 return ret;
77}
78
Anthony Liguori33436602007-11-12 21:30:26 -060079/* A small wrapper to also acknowledge the interrupt when it's handled.
80 * I really need an EIO hook for the vring so I can ack the interrupt once we
81 * know that we'll be handling the IRQ but before we invoke the callback since
82 * the callback may notify the host which results in the host attempting to
83 * raise an interrupt that we would then mask once we acknowledged the
84 * interrupt. */
85static irqreturn_t vp_interrupt(int irq, void *opaque)
86{
87 struct virtio_pci_device *vp_dev = opaque;
Anthony Liguori33436602007-11-12 21:30:26 -060088 u8 isr;
89
90 /* reading the ISR has the effect of also clearing it so it's very
91 * important to save off the value. */
Michael S. Tsirkinaf535722014-12-02 14:35:27 +020092 isr = ioread8(vp_dev->isr);
Anthony Liguori33436602007-11-12 21:30:26 -060093
94 /* It's definitely not us if the ISR was not high */
95 if (!isr)
96 return IRQ_NONE;
97
98 /* Configuration change? Tell driver if it wants to know. */
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +030099 if (isr & VIRTIO_PCI_ISR_CONFIG)
100 vp_config_changed(irq, opaque);
Anthony Liguori33436602007-11-12 21:30:26 -0600101
Michael S. Tsirkin77cf52462009-05-14 13:55:31 +0300102 return vp_vring_interrupt(irq, opaque);
Anthony Liguori33436602007-11-12 21:30:26 -0600103}
104
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300105static void vp_free_vectors(struct virtio_device *vdev)
106{
107 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
108 int i;
109
110 if (vp_dev->intx_enabled) {
111 free_irq(vp_dev->pci_dev->irq, vp_dev);
112 vp_dev->intx_enabled = 0;
113 }
114
115 for (i = 0; i < vp_dev->msix_used_vectors; ++i)
116 free_irq(vp_dev->msix_entries[i].vector, vp_dev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300117
Jason Wang75a0a522012-08-28 13:54:14 +0200118 for (i = 0; i < vp_dev->msix_vectors; i++)
119 if (vp_dev->msix_affinity_masks[i])
120 free_cpumask_var(vp_dev->msix_affinity_masks[i]);
121
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300122 if (vp_dev->msix_enabled) {
123 /* Disable the vector used for configuration */
Michael S. Tsirkin6f8f23d2014-12-07 18:18:09 +0200124 vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300125
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300126 pci_disable_msix(vp_dev->pci_dev);
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300127 vp_dev->msix_enabled = 0;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300128 }
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300129
Andrew Vaginf11335d2013-07-02 15:35:13 +0930130 vp_dev->msix_vectors = 0;
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300131 vp_dev->msix_used_vectors = 0;
132 kfree(vp_dev->msix_names);
133 vp_dev->msix_names = NULL;
134 kfree(vp_dev->msix_entries);
135 vp_dev->msix_entries = NULL;
Jason Wang75a0a522012-08-28 13:54:14 +0200136 kfree(vp_dev->msix_affinity_masks);
137 vp_dev->msix_affinity_masks = NULL;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300138}
139
Rusty Russellf68d2402009-09-23 22:26:29 -0600140static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
141 bool per_vq_vectors)
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300142{
143 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
144 const char *name = dev_name(&vp_dev->vdev.dev);
145 unsigned i, v;
146 int err = -ENOMEM;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300147
Andrew Vaginf11335d2013-07-02 15:35:13 +0930148 vp_dev->msix_vectors = nvectors;
149
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300150 vp_dev->msix_entries = kmalloc(nvectors * sizeof *vp_dev->msix_entries,
151 GFP_KERNEL);
152 if (!vp_dev->msix_entries)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300153 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300154 vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
155 GFP_KERNEL);
156 if (!vp_dev->msix_names)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300157 goto error;
Jason Wang75a0a522012-08-28 13:54:14 +0200158 vp_dev->msix_affinity_masks
159 = kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
160 GFP_KERNEL);
161 if (!vp_dev->msix_affinity_masks)
162 goto error;
163 for (i = 0; i < nvectors; ++i)
164 if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
165 GFP_KERNEL))
166 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300167
168 for (i = 0; i < nvectors; ++i)
169 vp_dev->msix_entries[i].entry = i;
170
Alexander Gordeev5e37f672014-03-13 11:23:37 +1030171 err = pci_enable_msix_exact(vp_dev->pci_dev,
172 vp_dev->msix_entries, nvectors);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300173 if (err)
174 goto error;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300175 vp_dev->msix_enabled = 1;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300176
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300177 /* Set the vector used for configuration */
178 v = vp_dev->msix_used_vectors;
179 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
180 "%s-config", name);
181 err = request_irq(vp_dev->msix_entries[v].vector,
182 vp_config_changed, 0, vp_dev->msix_names[v],
183 vp_dev);
184 if (err)
185 goto error;
186 ++vp_dev->msix_used_vectors;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300187
Michael S. Tsirkin6f8f23d2014-12-07 18:18:09 +0200188 v = vp_dev->config_vector(vp_dev, v);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300189 /* Verify we had enough resources to assign the vector */
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300190 if (v == VIRTIO_MSI_NO_VECTOR) {
191 err = -EBUSY;
192 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300193 }
194
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300195 if (!per_vq_vectors) {
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300196 /* Shared vector for all VQs */
197 v = vp_dev->msix_used_vectors;
198 snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
199 "%s-virtqueues", name);
200 err = request_irq(vp_dev->msix_entries[v].vector,
201 vp_vring_interrupt, 0, vp_dev->msix_names[v],
202 vp_dev);
203 if (err)
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300204 goto error;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300205 ++vp_dev->msix_used_vectors;
206 }
207 return 0;
Michael S. Tsirkinff52c3f2009-07-23 14:57:37 +0300208error:
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300209 vp_free_vectors(vdev);
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300210 return err;
211}
212
Rusty Russellf68d2402009-09-23 22:26:29 -0600213static int vp_request_intx(struct virtio_device *vdev)
214{
215 int err;
216 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
217
218 err = request_irq(vp_dev->pci_dev->irq, vp_interrupt,
219 IRQF_SHARED, dev_name(&vdev->dev), vp_dev);
220 if (!err)
221 vp_dev->intx_enabled = 1;
222 return err;
223}
224
Michael S. Tsirkinb09f00b2014-12-07 18:03:49 +0200225static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
226 void (*callback)(struct virtqueue *vq),
227 const char *name,
228 u16 msix_vec)
229{
230 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
231 struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
232 struct virtqueue *vq;
233 unsigned long flags;
234
235 /* fill out our structure that represents an active queue */
236 if (!info)
237 return ERR_PTR(-ENOMEM);
238
239 vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
240 if (IS_ERR(vq))
241 goto out_info;
242
243 info->vq = vq;
Krishna Kumar005b20a2011-10-05 11:08:59 +0530244 if (callback) {
245 spin_lock_irqsave(&vp_dev->lock, flags);
246 list_add(&info->node, &vp_dev->virtqueues);
247 spin_unlock_irqrestore(&vp_dev->lock, flags);
248 } else {
249 INIT_LIST_HEAD(&info->node);
250 }
Anthony Liguori33436602007-11-12 21:30:26 -0600251
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200252 vp_dev->vqs[index] = info;
Anthony Liguori33436602007-11-12 21:30:26 -0600253 return vq;
254
Anthony Liguori33436602007-11-12 21:30:26 -0600255out_info:
256 kfree(info);
Michael S. Tsirkinb09f00b2014-12-07 18:03:49 +0200257 return vq;
Anthony Liguori33436602007-11-12 21:30:26 -0600258}
259
Michael S. Tsirkin5386cef2014-12-07 18:03:49 +0200260static void vp_del_vq(struct virtqueue *vq)
261{
262 struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
263 struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
264 unsigned long flags;
265
266 spin_lock_irqsave(&vp_dev->lock, flags);
267 list_del(&info->node);
268 spin_unlock_irqrestore(&vp_dev->lock, flags);
269
270 vp_dev->del_vq(info);
Anthony Liguori33436602007-11-12 21:30:26 -0600271 kfree(info);
272}
273
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300274/* the config->del_vqs() implementation */
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +0200275void vp_del_vqs(struct virtio_device *vdev)
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600276{
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300277 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600278 struct virtqueue *vq, *n;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300279 struct virtio_pci_vq_info *info;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600280
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300281 list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200282 info = vp_dev->vqs[vq->index];
Michael S. Tsirkin31198152010-02-25 19:08:55 +0200283 if (vp_dev->per_vq_vectors &&
284 info->msix_vector != VIRTIO_MSI_NO_VECTOR)
Rusty Russellf68d2402009-09-23 22:26:29 -0600285 free_irq(vp_dev->msix_entries[info->msix_vector].vector,
286 vq);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600287 vp_del_vq(vq);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300288 }
289 vp_dev->per_vq_vectors = false;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300290
291 vp_free_vectors(vdev);
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200292 kfree(vp_dev->vqs);
Michael S. Tsirkin80e95412015-01-04 17:21:58 +0200293 vp_dev->vqs = NULL;
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600294}
295
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300296static int vp_try_to_find_vqs(struct virtio_device *vdev, unsigned nvqs,
297 struct virtqueue *vqs[],
298 vq_callback_t *callbacks[],
299 const char *names[],
Rusty Russellf68d2402009-09-23 22:26:29 -0600300 bool use_msix,
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300301 bool per_vq_vectors)
302{
303 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Rusty Russellf68d2402009-09-23 22:26:29 -0600304 u16 msix_vec;
305 int i, err, nvectors, allocated_vectors;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300306
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200307 vp_dev->vqs = kmalloc(nvqs * sizeof *vp_dev->vqs, GFP_KERNEL);
308 if (!vp_dev->vqs)
309 return -ENOMEM;
310
Rusty Russellf68d2402009-09-23 22:26:29 -0600311 if (!use_msix) {
312 /* Old style: one normal interrupt for change and all vqs. */
313 err = vp_request_intx(vdev);
314 if (err)
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200315 goto error_find;
Rusty Russellf68d2402009-09-23 22:26:29 -0600316 } else {
317 if (per_vq_vectors) {
318 /* Best option: one for change interrupt, one per vq. */
319 nvectors = 1;
320 for (i = 0; i < nvqs; ++i)
321 if (callbacks[i])
322 ++nvectors;
323 } else {
324 /* Second best: one for change, shared for all vqs. */
325 nvectors = 2;
326 }
327
328 err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
329 if (err)
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200330 goto error_find;
Rusty Russellf68d2402009-09-23 22:26:29 -0600331 }
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300332
333 vp_dev->per_vq_vectors = per_vq_vectors;
334 allocated_vectors = vp_dev->msix_used_vectors;
335 for (i = 0; i < nvqs; ++i) {
Michael S. Tsirkin6457f122012-09-05 21:47:45 +0300336 if (!names[i]) {
337 vqs[i] = NULL;
338 continue;
339 } else if (!callbacks[i] || !vp_dev->msix_enabled)
Rusty Russellf68d2402009-09-23 22:26:29 -0600340 msix_vec = VIRTIO_MSI_NO_VECTOR;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300341 else if (vp_dev->per_vq_vectors)
Rusty Russellf68d2402009-09-23 22:26:29 -0600342 msix_vec = allocated_vectors++;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300343 else
Rusty Russellf68d2402009-09-23 22:26:29 -0600344 msix_vec = VP_MSIX_VQ_VECTOR;
Michael S. Tsirkinb09f00b2014-12-07 18:03:49 +0200345 vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300346 if (IS_ERR(vqs[i])) {
347 err = PTR_ERR(vqs[i]);
348 goto error_find;
349 }
Michael S. Tsirkin0b22bd02009-10-22 15:06:06 +0200350
351 if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
352 continue;
353
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300354 /* allocate per-vq irq if available and necessary */
Michael S. Tsirkin0b22bd02009-10-22 15:06:06 +0200355 snprintf(vp_dev->msix_names[msix_vec],
356 sizeof *vp_dev->msix_names,
357 "%s-%s",
358 dev_name(&vp_dev->vdev.dev), names[i]);
359 err = request_irq(vp_dev->msix_entries[msix_vec].vector,
360 vring_interrupt, 0,
361 vp_dev->msix_names[msix_vec],
362 vqs[i]);
363 if (err) {
364 vp_del_vq(vqs[i]);
365 goto error_find;
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300366 }
367 }
368 return 0;
369
370error_find:
371 vp_del_vqs(vdev);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300372 return err;
373}
374
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300375/* the config->find_vqs() implementation */
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +0200376int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
377 struct virtqueue *vqs[],
378 vq_callback_t *callbacks[],
379 const char *names[])
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600380{
Rusty Russellf68d2402009-09-23 22:26:29 -0600381 int err;
Michael S. Tsirkin82af8ce2009-05-14 13:55:41 +0300382
Rusty Russellf68d2402009-09-23 22:26:29 -0600383 /* Try MSI-X with one vector per queue. */
384 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names, true, true);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300385 if (!err)
386 return 0;
Rusty Russellf68d2402009-09-23 22:26:29 -0600387 /* Fallback: MSI-X with one vector for config, one shared for queues. */
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300388 err = vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
Rusty Russellf68d2402009-09-23 22:26:29 -0600389 true, false);
Michael S. Tsirkine969fed2009-07-26 15:48:08 +0300390 if (!err)
391 return 0;
392 /* Finally fall back to regular interrupts. */
Rusty Russellf68d2402009-09-23 22:26:29 -0600393 return vp_try_to_find_vqs(vdev, nvqs, vqs, callbacks, names,
394 false, false);
Michael S. Tsirkind2a7ddd2009-06-12 22:16:36 -0600395}
396
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +0200397const char *vp_bus_name(struct virtio_device *vdev)
Rick Jones66846042011-11-14 14:17:08 +0000398{
399 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
400
401 return pci_name(vp_dev->pci_dev);
402}
403
Jason Wang75a0a522012-08-28 13:54:14 +0200404/* Setup the affinity for a virtqueue:
405 * - force the affinity for per vq vector
406 * - OR over all affinities for shared MSI
407 * - ignore the affinity request if we're using INTX
408 */
Michael S. Tsirkin38eb4a22014-12-07 18:41:16 +0200409int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
Jason Wang75a0a522012-08-28 13:54:14 +0200410{
411 struct virtio_device *vdev = vq->vdev;
412 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
Michael S. Tsirkin3ec7a772014-12-03 17:50:50 +0200413 struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
Jason Wang75a0a522012-08-28 13:54:14 +0200414 struct cpumask *mask;
415 unsigned int irq;
416
417 if (!vq->callback)
418 return -EINVAL;
419
420 if (vp_dev->msix_enabled) {
421 mask = vp_dev->msix_affinity_masks[info->msix_vector];
422 irq = vp_dev->msix_entries[info->msix_vector].vector;
423 if (cpu == -1)
424 irq_set_affinity_hint(irq, NULL);
425 else {
Jiang Liu210d1502015-06-04 16:41:44 +0800426 cpumask_clear(mask);
Jason Wang75a0a522012-08-28 13:54:14 +0200427 cpumask_set_cpu(cpu, mask);
428 irq_set_affinity_hint(irq, mask);
429 }
430 }
431 return 0;
432}
433
Aaron Lu9e266ec2013-09-09 09:57:12 +0930434#ifdef CONFIG_PM_SLEEP
Amit Shahf0fe6f12011-12-22 16:58:26 +0530435static int virtio_pci_freeze(struct device *dev)
436{
437 struct pci_dev *pci_dev = to_pci_dev(dev);
438 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
Amit Shahf0fe6f12011-12-22 16:58:26 +0530439 int ret;
440
Michael S. Tsirkinc6716ba2014-10-14 10:40:35 +1030441 ret = virtio_device_freeze(&vp_dev->vdev);
Amit Shahf0fe6f12011-12-22 16:58:26 +0530442
443 if (!ret)
444 pci_disable_device(pci_dev);
445 return ret;
446}
447
Amit Shahf0fe6f12011-12-22 16:58:26 +0530448static int virtio_pci_restore(struct device *dev)
449{
450 struct pci_dev *pci_dev = to_pci_dev(dev);
451 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
Amit Shahf0fe6f12011-12-22 16:58:26 +0530452 int ret;
453
Amit Shah0517fdd2012-03-29 12:54:43 +0530454 ret = pci_enable_device(pci_dev);
455 if (ret)
456 return ret;
457
458 pci_set_master(pci_dev);
Michael S. Tsirkinc6716ba2014-10-14 10:40:35 +1030459 return virtio_device_restore(&vp_dev->vdev);
Amit Shahf0fe6f12011-12-22 16:58:26 +0530460}
461
Michael S. Tsirkin9a4253d2014-12-11 21:47:49 +0200462static const struct dev_pm_ops virtio_pci_pm_ops = {
Amit Shahf878d0b2012-03-29 12:58:05 +0530463 SET_SYSTEM_SLEEP_PM_OPS(virtio_pci_freeze, virtio_pci_restore)
Amit Shahd0775362011-12-22 16:58:25 +0530464};
Anthony Liguori33436602007-11-12 21:30:26 -0600465#endif
Michael S. Tsirkin9a4253d2014-12-11 21:47:49 +0200466
467
468/* Qumranet donated their vendor ID for devices 0x1000 thru 0x10FF. */
469static const struct pci_device_id virtio_pci_id_table[] = {
470 { PCI_DEVICE(0x1af4, PCI_ANY_ID) },
471 { 0 }
472};
473
474MODULE_DEVICE_TABLE(pci, virtio_pci_id_table);
475
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200476static void virtio_pci_release_dev(struct device *_d)
477{
478 struct virtio_device *vdev = dev_to_virtio(_d);
479 struct virtio_pci_device *vp_dev = to_vp_device(vdev);
480
481 /* As struct device is a kobject, it's not safe to
482 * free the memory (including the reference counter itself)
483 * until it's release callback. */
484 kfree(vp_dev);
485}
486
Michael S. Tsirkin9a4253d2014-12-11 21:47:49 +0200487static int virtio_pci_probe(struct pci_dev *pci_dev,
488 const struct pci_device_id *id)
489{
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200490 struct virtio_pci_device *vp_dev;
491 int rc;
492
493 /* allocate our structure and fill it out */
494 vp_dev = kzalloc(sizeof(struct virtio_pci_device), GFP_KERNEL);
495 if (!vp_dev)
496 return -ENOMEM;
497
498 pci_set_drvdata(pci_dev, vp_dev);
499 vp_dev->vdev.dev.parent = &pci_dev->dev;
500 vp_dev->vdev.dev.release = virtio_pci_release_dev;
501 vp_dev->pci_dev = pci_dev;
502 INIT_LIST_HEAD(&vp_dev->virtqueues);
503 spin_lock_init(&vp_dev->lock);
504
505 /* Disable MSI/MSIX to bring device to a known good state. */
506 pci_msi_off(pci_dev);
507
508 /* enable the device */
509 rc = pci_enable_device(pci_dev);
510 if (rc)
511 goto err_enable_device;
512
513 rc = pci_request_regions(pci_dev, "virtio-pci");
514 if (rc)
515 goto err_request_regions;
516
Michael S. Tsirkinac399d82015-01-15 17:54:13 +0200517 if (force_legacy) {
Michael S. Tsirkin1fcf0512014-12-11 13:59:51 +0200518 rc = virtio_pci_legacy_probe(vp_dev);
Michael S. Tsirkinac399d82015-01-15 17:54:13 +0200519 /* Also try modern mode if we can't map BAR0 (no IO space). */
520 if (rc == -ENODEV || rc == -ENOMEM)
521 rc = virtio_pci_modern_probe(vp_dev);
522 if (rc)
523 goto err_probe;
524 } else {
525 rc = virtio_pci_modern_probe(vp_dev);
526 if (rc == -ENODEV)
527 rc = virtio_pci_legacy_probe(vp_dev);
528 if (rc)
529 goto err_probe;
530 }
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200531
532 pci_set_master(pci_dev);
533
534 rc = register_virtio_device(&vp_dev->vdev);
535 if (rc)
536 goto err_register;
537
538 return 0;
539
540err_register:
Michael S. Tsirkin1fcf0512014-12-11 13:59:51 +0200541 if (vp_dev->ioaddr)
542 virtio_pci_legacy_remove(vp_dev);
543 else
544 virtio_pci_modern_remove(vp_dev);
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200545err_probe:
546 pci_release_regions(pci_dev);
547err_request_regions:
548 pci_disable_device(pci_dev);
549err_enable_device:
550 kfree(vp_dev);
551 return rc;
Michael S. Tsirkin9a4253d2014-12-11 21:47:49 +0200552}
553
554static void virtio_pci_remove(struct pci_dev *pci_dev)
555{
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200556 struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
557
558 unregister_virtio_device(&vp_dev->vdev);
559
Michael S. Tsirkin1fcf0512014-12-11 13:59:51 +0200560 if (vp_dev->ioaddr)
561 virtio_pci_legacy_remove(vp_dev);
562 else
563 virtio_pci_modern_remove(vp_dev);
Michael S. Tsirkinff31d2e2015-01-13 11:23:32 +0200564
565 pci_release_regions(pci_dev);
566 pci_disable_device(pci_dev);
Michael S. Tsirkin9a4253d2014-12-11 21:47:49 +0200567}
568
569static struct pci_driver virtio_pci_driver = {
570 .name = "virtio-pci",
571 .id_table = virtio_pci_id_table,
572 .probe = virtio_pci_probe,
573 .remove = virtio_pci_remove,
574#ifdef CONFIG_PM_SLEEP
575 .driver.pm = &virtio_pci_pm_ops,
576#endif
577};
578
579module_pci_driver(virtio_pci_driver);
Herbert Xu5ff16112014-12-17 00:54:03 +0200580
581MODULE_AUTHOR("Anthony Liguori <aliguori@us.ibm.com>");
582MODULE_DESCRIPTION("virtio-pci");
583MODULE_LICENSE("GPL");
584MODULE_VERSION("1");